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gunlaker
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BC estimates for these .32 cal bullets
Mar 5th, 2016 at 10:12am
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Hi,

I have a few different .32 cal bullets that I shoot.  Can anyone give me BC estimates for them?   

Hoch nose pour .322200
Hoch .32 Darr style bullet 200gr
Saeco 200gr tapered.   

Thanks very much,

Chris.

  
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CajunRebel
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Re: BC estimates for these .32 cal bullets
Reply #1 - Mar 5th, 2016 at 11:09am
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BIG GUESS - Hoch (custom) NON-Tapered 322200 1:25, .322/208gr, using JBM calc. - BC: .320, SG: 11.10.  Carefully measured but unsure if nose radius is correct - .77814", 2.51 nose dia.
  
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frnkeore
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Re: BC estimates for these .32 cal bullets
Reply #2 - Mar 5th, 2016 at 12:59pm
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Chris,
If you can post clear pictures of them as well as the length and diameter. I can scale the rest of it and run them through my bullet program.

Frank
  
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Re: BC estimates for these .32 cal bullets
Reply #3 - Mar 5th, 2016 at 3:14pm
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CR,
I've copied it to my computor and will try to work with it but, as posted here, the edges aren't very distinct. I need pictures that look more like this.

Frank
  
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Re: BC estimates for these .32 cal bullets
Reply #4 - Mar 5th, 2016 at 6:19pm
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Back again... Here are my measurements

Weight: 208gr
Caliber/Sized Dia: .321
Overall Length: 1.072
Nose Length: .35
Meplat: .15
Nose/Bore Ride Dia: .314
Ogive Radius in Nose Dia: 2.51
BC Guesstimate: .32


  
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frnkeore
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Re: BC estimates for these .32 cal bullets
Reply #5 - Mar 5th, 2016 at 6:35pm
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CR,
Those are much better pictures, thank you.

I think I can make out the parallel, bore riding area but, if you have a mic, set it to that (or a little tighter) .314 and spin the bullet, then measure length of the shiny area or send a picture of that, also. The  diameter of the grooves would also be helpful.

Frank
  
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Re: BC estimates for these .32 cal bullets
Reply #6 - Mar 5th, 2016 at 7:00pm
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The Groove diameter is .321, bands are .321, the bore diameter is .314, it starts in front of the first band.  The shiny area is: .190.
  
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frnkeore
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Re: BC estimates for these .32 cal bullets
Reply #7 - Mar 5th, 2016 at 7:22pm
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CR,
Thank you.

What I ment was the depth of the grease grooves in the bullet but, I think I can figure that out from the last picture.

Frank
  
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Re: BC estimates for these .32 cal bullets
Reply #8 - Mar 5th, 2016 at 7:28pm
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oops...

Grove dia - grease grove dia???
.321-.284=.037   ????
  
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Re: BC estimates for these .32 cal bullets
Reply #9 - Mar 5th, 2016 at 7:30pm
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Ok, thank you, again Smiley

Frank
  
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Re: BC estimates for these .32 cal bullets
Reply #10 - Mar 5th, 2016 at 7:50pm
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Once I polished that nose Roll Eyes I was better able to measure the nose length.  I think the nose length is .275, which is 1.6 diameters for a BC of .270 (tmtpages calc.).  Wonder how close that is to your calc?
  
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Re: BC estimates for these .32 cal bullets
Reply #11 - Mar 5th, 2016 at 8:42pm
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frnkeore wrote on Mar 5th, 2016 at 12:59pm:
Chris,
If you can post clear pictures of them as well as the length and diameter. I can scale the rest of it and run them through my bullet program.

Frank


Hi Frank,

I don't want to cause you a lot of work.  I just figured that someone would have data for these bullets as they are pretty common.  I will attach a picture and some measurements of some of my .32-40 bullets in a few minutes.

Chris.
  
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Re: BC estimates for these .32 cal bullets
Reply #12 - Mar 5th, 2016 at 9:03pm
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Here are my .32-40 bullets and approximate dimensions.  I just quickly did some measurements with my calipers. They could be off by a tiny bit.  The Saeco ones especially as the moulds are not exactly perfectly round.   The second Brooks mold is one of my favorites.

From left to right:
1) Hoch 322200, 1.070" long, 0.120" meplat.  driving bands taper from 0.320" to 0.311"

2) Brooks Elliptical PP bullet.  1.048" long, 0.310" diameter.

3) Saeco tapered 200gr.  1.040" long, 0.19" meplat, tapers from 0.322" to 0.313"

4) Saeco tapered 165gr.  0.886" long, 0.19" meplat, tapers from 0.323" to 0.312"

5) Brooks 198gr.  1.050" long, 0.120" meplat, tapers from 0.322" to 0.313"

6) Original Zischang mold.  I thought I'd throw this one in as some might find it interesting.  Although I've read that he used only cylindrical bullets, the molds I have use a very small amount of taper.  I have not shot this rifle yet so don't know how they shoot.
0.975" long, meplat 0.16", slight taper from 0.320" to 0.318"   

7) Darr - I have not used this one yet.  It appears to be around 1.17" long, and I believe 0.322" in diameter.  Weight should be 205gr. 

Chris.
« Last Edit: Mar 5th, 2016 at 9:15pm by gunlaker »  
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Re: BC estimates for these .32 cal bullets
Reply #13 - Mar 7th, 2016 at 1:50pm
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First up is the 1.072 long Hoch. CR, check the dimensions against your bullet.
  
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Re: BC estimates for these .32 cal bullets
Reply #14 - Mar 7th, 2016 at 2:55pm
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Chris, let me know what dimensions are off.

Frank
« Last Edit: Mar 7th, 2016 at 3:23pm by frnkeore »  
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